Well. I've found it, and listened to it.
Crikey.
It's like having a vindaloo curry while sober. It just aint right. Away from the televised event, away from one's own sense of magnificent sacrifice, I'm not sure that the music works too well. But if you've ever watched or run London, it will always thump you in the back.
Anyway, you can listen to it temporarily by clicking here:
www.runningcommentary.net/audio/flmtheme.mp3
If you want to keep it, of course, you will have to purchase it.